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Partnerships | 9 Months Ended
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Sep. 30, 2025
Organization, Consolidation and Presentation of Financial Statements [Abstract] |
Partnerships | Note 5. Partnerships In March 2024, the Company extended a joint development agreement (“JDA”) with Hyundai Motor Company (“Hyundai”) to jointly research and develop B-sample Li-Metal battery technology, until December 2025. Under the terms of the JDA, the Company will fund the research and development activities, and the capital expenditures related to the buildout of pilot manufacturing lines. The Company’s B-Sample JDA with Honda Motor Company, Ltd. (“Honda”) has been replaced with a B-sample services agreement in January 2025, with a term through December 2025. The Company’s partnership with GM Global Technology Operations LLC (“GM Technology”), an affiliate of GM Ventures LLC (“GM Ventures”), and General Motors Holdings LLC (“GM Holdings”) (collectively, “General Motors” or “GM”) to jointly research and develop the A-Sample Li-Metal batteries concluded in September 2024. The following table summarizes credits to research and development recorded in accordance with the terms of the JDA agreements: ​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ | Three Months Ended September 30, | ​ | Nine Months Ended September 30,
(in thousands) | 2025 |  | 2024 |  | 2025 |  | 2024
Research and development (related party) | $ | — | ​ | $ | 1,973 | ​ | $ | — | ​ | $ | 3,190
Research and development (non-related party) | ​ | — | ​ | ​ | 2,500 | ​ | ​ | — | ​ | ​ | 5,385
Total reimbursements to research and development | $ | — | ​ | $ | 4,473 | ​ | $ | — | ​ | $ | 8,575

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